/* =========================================
   Taalcentrum Kosmos - Modern CSS
   ========================================= */

/* --- Custom Properties --- */
:root {
  --color-primary: #82b540;
  --color-primary-dark: #6a9a30;
  --color-primary-light: #a3d465;
  --color-primary-bg: #f0f7e6;
  --color-text: #333;
  --color-text-light: #666;
  --color-text-muted: #999;
  --color-white: #fff;
  --color-bg: #fff;
  --color-bg-light: #f8faf5;
  --color-bg-dark: #2c2c2c;
  --color-border: #e0e0e0;
  --font-heading: 'Lato', sans-serif;
  --font-body: 'Open Sans', sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.12);
  --shadow-xl: 0 16px 48px rgba(0,0,0,.15);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --container: 1140px;
  --transition: .3s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  font-size: clamp(0.938rem, 0.9rem + 0.2vw, 1.063rem);
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--color-primary-dark); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: clamp(2rem, 1.5rem + 2.5vw, 3.25rem); }
h2 { font-size: clamp(1.6rem, 1.3rem + 1.5vw, 2.25rem); }
h3 { font-size: clamp(1.3rem, 1.1rem + 1vw, 1.75rem); }
h4 { font-size: clamp(1.1rem, 1rem + .5vw, 1.35rem); }
h5 { font-size: clamp(1rem, .95rem + .3vw, 1.15rem); }

p { margin-bottom: 1rem; }

ul, ol { list-style: none; }

button { cursor: pointer; font-family: inherit; }

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* --- Header / Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo img {
  height: 45px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-menu > li { position: relative; }

.nav-menu > li > a {
  display: block;
  padding: 0.5rem 1rem;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.938rem;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.nav-menu > li > a:hover,
.nav-menu > li.active > a {
  color: var(--color-primary-dark);
  background: var(--color-primary-bg);
}

/* Dropdown */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.5rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.nav-menu > li:hover > .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}

.nav-dropdown a:hover {
  background: var(--color-primary-bg);
  color: var(--color-primary-dark);
}

/* Hamburger */
.hamburger {
  display: none;
  background: none;
  border: none;
  width: 36px;
  height: 36px;
  position: relative;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px auto;
  transition: transform var(--transition), opacity var(--transition);
  border-radius: 2px;
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition);
}

.mobile-overlay.active { opacity: 1; }

/* Mobile nav */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -280px;
  width: 280px;
  height: 100%;
  background: var(--color-white);
  z-index: 999;
  padding: 80px 1.5rem 2rem;
  overflow-y: auto;
  transition: right var(--transition);
  box-shadow: var(--shadow-xl);
}

.mobile-nav.active { right: 0; }

.mobile-nav a {
  display: block;
  padding: 0.75rem 0;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav a:hover { color: var(--color-primary-dark); }

.mobile-nav .mobile-dropdown-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  padding: 0.75rem 0;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav .mobile-dropdown-label::after {
  content: '+';
  font-size: 1.25rem;
  transition: transform var(--transition);
}

.mobile-nav .mobile-dropdown-label.open::after {
  content: '\2212';
}

.mobile-nav .mobile-sub {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}

.mobile-nav .mobile-sub.open { max-height: 300px; }

.mobile-nav .mobile-sub a {
  padding-left: 1rem;
  font-size: 0.95rem;
  font-weight: 400;
}

/* --- Hero Carousel --- */
.hero {
  position: relative;
  overflow: hidden;
}

.hero-track {
  display: flex;
  scroll-snap-type: x mandatory;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.hero-track::-webkit-scrollbar { display: none; }

.hero-slide {
  flex: 0 0 100%;
  scroll-snap-align: start;
  position: relative;
  min-height: clamp(350px, 50vw, 600px);
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
}

.hero-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,.55) 0%, rgba(0,0,0,.25) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--color-white);
  max-width: 650px;
  padding: 2rem 1.5rem;
}

.hero-content h1 {
  color: var(--color-white);
  font-weight: 900;
  margin-bottom: 1rem;
  text-shadow: 0 2px 8px rgba(0,0,0,.3);
}

.hero-content p {
  font-size: clamp(1rem, .9rem + .5vw, 1.15rem);
  font-weight: 600;
  margin-bottom: 1.75rem;
  text-shadow: 0 1px 4px rgba(0,0,0,.3);
}

/* Hero dots */
.hero-dots {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.5rem;
  z-index: 2;
}

.hero-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--color-white);
  background: transparent;
  cursor: pointer;
  transition: background var(--transition);
  padding: 0;
}

.hero-dot.active { background: var(--color-white); }

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.938rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
  line-height: 1.5;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid var(--color-white);
}

.btn-outline:hover {
  background: var(--color-white);
  color: var(--color-primary-dark);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.813rem;
}

/* --- Sections --- */
.section {
  padding: clamp(3rem, 2.5rem + 3vw, 6rem) 0;
}

.section-light { background: var(--color-bg-light); }
.section-green { background: var(--color-primary-bg); }

.section-title {
  text-align: center;
  margin-bottom: 1rem;
}

.section-subtitle {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3rem;
  color: var(--color-text-light);
  font-weight: 600;
}

/* --- Icon Cards (homepage) --- */
.icon-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.icon-card {
  text-align: center;
  padding: 2rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.icon-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.icon-card a { color: inherit; }

.icon-card img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  margin: 0 auto 1.25rem;
}

.icon-card h4 {
  color: var(--color-primary-dark);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.icon-card p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-grid h3 { margin-bottom: 1.25rem; font-weight: 900; }

.about-grid img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

/* --- Course Cards (homepage) --- */
.course-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.course-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.course-card a { color: inherit; }

.course-card-img {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
}

.course-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}

.course-card:hover .course-card-img img {
  transform: scale(1.05);
}

.course-card-body {
  padding: 1.25rem;
}

.course-card-body h5 {
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.course-card-body span {
  font-size: 0.813rem;
  color: var(--color-text-light);
  display: block;
  margin-bottom: 0.75rem;
}

.course-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.813rem;
}

.course-card-price {
  font-weight: 700;
  color: var(--color-primary-dark);
}

.course-card-info {
  color: var(--color-text-muted);
}

.course-card-arrow {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.25rem;
}

/* --- Page Banner --- */
.page-banner {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  padding: clamp(2rem, 1.5rem + 2vw, 3.5rem) 0;
  color: var(--color-white);
}

.page-banner h1 {
  color: var(--color-white);
  font-weight: 900;
  font-size: clamp(1.5rem, 1.2rem + 1.5vw, 2.5rem);
}

/* --- Content Layout with Sidebar --- */
.layout-sidebar {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 3rem;
  align-items: start;
}

.content-area article { margin-bottom: 2rem; }

.content-area img {
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  width: 100%;
}

.content-area h4 {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-primary-bg);
}

.content-area p { margin-bottom: 1rem; color: var(--color-text-light); }

/* --- Sidebar --- */
.sidebar h4 {
  margin-bottom: 1.25rem;
  font-weight: 700;
}

.sidebar-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 1.25rem;
  transition: box-shadow var(--transition);
}

.sidebar-card:hover { box-shadow: var(--shadow-md); }

.sidebar-card-body {
  padding: 1rem 1.25rem;
}

.sidebar-card-body h5 {
  font-weight: 700;
  margin-bottom: 0.375rem;
}

.sidebar-card-body span,
.sidebar-card-body p {
  font-size: 0.813rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.sidebar-card-meta {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.813rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-card-meta .price {
  font-weight: 700;
  color: var(--color-primary-dark);
}

.sidebar-card-meta .group {
  color: var(--color-text-muted);
}

.sidebar-card .btn {
  display: block;
  text-align: center;
  margin: 0;
  border-radius: 0;
}

.sidebar-note {
  font-size: 0.813rem;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-top: 0.5rem;
}

/* --- Language Page Layout --- */
.lang-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 3rem;
  align-items: start;
}

.lang-sidebar-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.lang-sidebar-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.lang-sidebar-card .card-body {
  padding: 1.25rem;
}

.lang-sidebar-card h4 { font-weight: 700; margin-bottom: 0.5rem; }
.lang-sidebar-card span { font-size: 0.875rem; color: var(--color-text-light); }

.lang-sidebar-card .card-meta {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}

.lang-sidebar-card .price { font-weight: 700; color: var(--color-primary-dark); }
.lang-sidebar-card .group { color: var(--color-text-muted); }

.person-box {
  display: flex;
  gap: 1rem;
  align-items: center;
  padding: 1.25rem;
  border-top: 1px solid var(--color-border);
}

.person-box img {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
}

.person-box .person-name { font-weight: 700; font-size: 0.875rem; }
.person-box .person-role { font-size: 0.75rem; color: var(--color-text-muted); }
.person-box .person-desc { font-size: 0.813rem; color: var(--color-text-light); margin-top: 0.75rem; }

.price-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
}

.price-bar .price-info .price { font-weight: 700; color: var(--color-primary-dark); }

.lang-content h4 {
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.lang-content h4:first-child { margin-top: 0; }

.lang-content p {
  margin-bottom: 1.25rem;
  color: var(--color-text-light);
}

/* --- Contact Form --- */
.form-group { margin-bottom: 1.25rem; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-control {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: 0.938rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(130,181,64,.2);
}

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
  font-size: 0.875rem;
  display: none;
}

.alert-success {
  background: #e8f5e9;
  color: #2e7d32;
  border: 1px solid #a5d6a7;
}

.alert-error {
  background: #fce4ec;
  color: #c62828;
  border: 1px solid #ef9a9a;
}

.alert.show { display: block; }

/* --- Contact Info --- */
.contact-info h4 { margin-bottom: 1rem; }

.contact-info p {
  margin-bottom: 1rem;
  color: var(--color-text-light);
  line-height: 1.8;
}

.contact-info strong { color: var(--color-text); }

/* --- Footer --- */
.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,.8);
  padding: clamp(3rem, 2rem + 3vw, 5rem) 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 3rem;
}

.footer-grid a { color: rgba(255,255,255,.7); }
.footer-grid a:hover { color: var(--color-primary-light); }

.footer-logo { margin-bottom: 1.25rem; }
.footer-logo img { height: 40px; width: auto; }

.footer-social {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.footer-social img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  transition: opacity var(--transition);
}

.footer-social img:hover { opacity: .8; }

.footer-grid h4 {
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.footer-grid ul li { margin-bottom: 0.5rem; }

.footer-grid ul li a {
  font-size: 0.875rem;
  line-height: 1.8;
}

.footer-contact p {
  font-size: 0.875rem;
  line-height: 1.8;
  margin-bottom: 0;
}

.footer-contact strong { color: var(--color-white); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding: 1.25rem 0;
  font-size: 0.813rem;
  color: rgba(255,255,255,.5);
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Utility --- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .icon-grid { grid-template-columns: repeat(2, 1fr); }
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; }
  .about-grid img { max-width: 400px; margin: 0 auto; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .layout-sidebar { grid-template-columns: 1fr; }
  .lang-layout { grid-template-columns: 1fr; }
  .lang-sidebar-card { max-width: 400px; }
}

@media (max-width: 768px) {
  .nav-menu { display: none; }
  .hamburger { display: block; }
  .mobile-overlay { display: block; pointer-events: none; }
  .mobile-overlay.active { pointer-events: auto; }

  .icon-grid { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .course-grid { grid-template-columns: 1fr 1fr; gap: 1rem; }

  .hero-slide { min-height: 350px; }
  .hero-content h1 { font-size: 1.75rem; }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }

  .form-row { grid-template-columns: 1fr; }

  .price-bar { flex-direction: column; gap: 1rem; text-align: center; }
}

@media (max-width: 480px) {
  .icon-grid { grid-template-columns: 1fr; }
  .course-grid { grid-template-columns: 1fr; }
}